SATELLITE COMMUNICATION

1. AJAL.A.J Assistant Professor –Dept of ECE, Federal Institute of Science And Technology (FISAT) TM MAIL: ec2reach@gmail.com

2. Astronautics

16. Satellite Natural Satellite Artificial Satellite

22. INDIAN SATELLITE

23. IN July 18, 1980, India launched the satellite Rohini 1 on an Satellite Launch Vehicle (SLV) rocket from the Sriharikota Island launch site

26. Satellite categories

28. Satellite orbit altitudes

29. Satellite frequency bands

31. Geostationary Communication Satellites in Orbit Today

32. Satellites in geostationary orbit

33. Satellite orbits

34. Geostationary Orbit

36. Polar Orbit

37. What is the period of the Moon, according to Kepler’s law? Example 16.1 Here C is a constant approximately equal to 1/100. The period is in seconds and the distance in kilometers.

38. According to Kepler’s law, what is the period of a satellite that is located at an orbit approximately 35,786 km above the Earth? Example 16.2 Solution Applying the formula, we get

39. Classical satellite systems base station or gateway Inter Satellite Link (ISL) Mobile User Link (MUL) Gateway Link (GWL) footprint small cells (spotbeams) User data PSTN ISDN GSM GWL MUL PSTN: Public Switched Telephone Network

40. Inclination inclination   satellite orbit perigee plane of satellite orbit equatorial plane

41. Elevation Elevation: angle  between center of satellite beam and surface  minimal elevation: elevation needed at least to communicate with the satellite footprint

43. Atmospheric attenuation Example: satellite systems at 4-6 GHz elevation of the satellite 5° 10° 20° 30° 40° 50° Attenuation of the signal in % 10 20 30 40 50 rain absorption fog absorption atmospheric absorption 

45. Orbits II earth km 35768 10000 1000 LEO (Globalstar, Irdium) HEO inner and outer Van Allen belts MEO (ICO) GEO (Inmarsat) Van-Allen-Belts: ionized particles 2000 - 6000 km and 15000 - 30000 km above earth surface

50. What’s on a satellite? Communications Power Sensors/Instruments “ Bus”